SKU: 47473614332

2.5"x21" | 300 GPD | 99.4% Salt Rejection | Watermaker | FilmTec Seawater Membrane

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Description

2.5"x21" | 300 GPD | 99.4% Salt Rejection | Watermaker | FilmTec Seawater MembraneDOW FILMTEC SW30 2521 Seawater RO Elements for Watermakers and Marine Systems DOW FILMTEC SW30 2521 elements have one of the highest flow rates available to meet the water demands of both sea based and land based desalinators. Commonly used in on board Watermakers to create drinking water from seawater for yachts, boats, and cruise ships, DOW FILMTEC marine SWRO elements offer the highest productivity while maintaining excellent salt rejection. DOW





DOW FILMTEC™ SW30-2521 Seawater RO Elements for Watermakers and Marine Systems



DOW FILMTEC SW30-2521 elements have one of the highest flow rates available to meet the water demands of both sea-based and land-based desalinators. Commonly used in on-board Watermakers to create drinking water from seawater for yachts, boats, and cruise ships, DOW FILMTEC marine SWRO elements offer the highest productivity while maintaining excellent salt rejection. DOW FILMTEC SW30 elements may also be operated at lower pressure to reduce pump size, cost, and operating expenses



DOW FILMTEC SW30-2521 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.



Specifications for SW30-2521



FilmTec Product:

SW30-2521


FilmTec Part Number:

80734
Size (Approximate): 2.5" Dia. x 21"L


Flow Rate:

300 gpd (1.1 m³ /d)


Applied Pressure:

800 psig (55 bar)


Stabilized Salt Rejection:

99.4%


Exterior:

Hard Shell Fiberglass


Membrane Type:

Polyamide Thin-Film


Composite

Permeate flow and salt rejection based: 32,000 ppm NaCl feed stream, 77°F, 5% recovery, 800 psig.



Operating Limits for SW30-2521



Maximum Operating Temperature:

113°F (45 °C)


Maximum Operating Pressure:

1,000 psig (69 bar)


Maximum Pressure Drop:

15 psig (1 bar)


Maximum Feed Flow Rate:

6 gpm (1.4 m³ /h)


pH Range, Continuous Operation*:

2-11


pH Range, Short-Term Cleaning**:

1-13


Maximum Feed Silt Density Index:

SDI 5


Fere Clorine Tolerance***:		 <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95 ° F
**Refer to cleaning guidelines.


***Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure.



Related Products for use with SW30-2521 Seawater Elements

F2521-14141000C

2.5x21 Fiberglass Pressure Vessel Membrane Housing for Seawater RO Membranes (Water Maker Pressure Vessel)
C-C2510-A11 Membrane Cleaning Cartridge with Acid Cleaner to Remove Scale Buildup and Prolong Membrane Life
C-C2510-A22 Membrane Cleaning Cartridge with Alkaline Cleaner to Remove Organics and Prolong Membrane Life
C-C2510-A88

Membrane Preservative Cartridge for Preserving the System and Membrane During Extended Periods of Non-Operation.
655139-03

Oil Adsorbing Filter Cartridge - Oil-Water Separator Replacement Cartridge, 20" Big Blue Pentair Pentek Filter
H-F10100CF

Plankton Filter - 10" Standard 100 Micron Spun Polypropylene Replacement Filter Cartridge



Benefits of DOW FilmTec Marine RO Membranes:



  • Convert seawater into drinking water on yachts, boats, cruise ships, off-shore platforms, and resorts


  • High flux reduces energy use or pressure required


  • Good rejection results in good quality water


  • FilmTec performance and quality



Common Applications for FilmTec SW30-2521 Seawater RO Elements:



  • Seawater Desalination


  • Marine Applications


  • Watermaker RO Systems


  • Yachts



Physical Dimensions of DOW FilmTec SW30-2521 SWRO

INCHES (MM)
A

21.0 (533)
B

1.19 (30)
C

0.75 (19)
D

2.4 (61)

SW30-2521 Fits nominal 2.5-Inch ID pressure vessels.

For more information, please visit this products webpage.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 47473614332

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Elizabeth W
Birmingham, US
★★★★★ 5
Important supplement for osteo issues
Nutritionist recommended quality brand is a good way to get calcium supplement. Easy to swallow capsules have no after-taste.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
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Verified Purchase
smf
Cuba, US
★★★★★ 4
Good supplement
In order to get the recommended dose, you need to take a lot of these in a day. However, they are easy to swallow and I trust this brand. If you're looking for a good calcium supplement, this is a good one.
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Reviewed in the United States on May 29, 2023
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K-9
Lowell, US
★★★★★ 5
Third party tested!
It's important to know it's 3rd party tested!
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Reviewed in the United States on April 8, 2026
K
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Kenneth K.
Louisville, US
★★★★★ 5
fast service
product as described fast service
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Reviewed in the United States on March 19, 2026
M
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Midwest Hacker
Houston, US
★★★★★ 5
This brand has been good for me overall but.....
I do find it harder to swallow a capsule, than a large pill. I agree that is odd but it is happening to me. So I went with the larger pill. The capsules tend to stick to my throat even when drinking water first.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 5, 2025

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